Fair Value Disclosures (Details) (Fair Value, Measurements, Nonrecurring, USD $) In Thousands, unless otherwise specified	12 Months Ended
	Nov. 30, 2012	Nov. 30, 2011
Assets measured at fair value on a nonrecurring basis
Long-lived assets held and used	$ 39,851	$ 34,022
Level 2
Assets measured at fair value on a nonrecurring basis
Long-lived assets held and used	0	75
Level 3
Assets measured at fair value on a nonrecurring basis
Long-lived assets held and used	$ 39,851	$ 33,947